If shadowFunction 2 is chosen (a parabola) and the height is maximum, it doesn't look as if the ball is moving straight up but
rather making an angle to the z-axis. The motion perceived, is the kind of motion that would make a parabolic shadow when viewed
from an angle making the motion as straight as possible.

When the 3D-environment is hidden, it is easier to perceive the motion as a
movement along a straight line. The 3D-environment strengthens the illusion.

The bounces are made using three different parabolas. Parabolas are the actual shape of a bouncing ball. I initially tried to use the absolute value of a
damped trigonometric function, since it's easier, but it didn't look like a realistic motion.